Rock-drill.



s.' FERGUSON.

809%( DRILL; PPLIQATIOH 4{"LED JINE 30. l9i l- BENEWED DEC. 26.!9!6.

mam Feb. 6, 19W. @SHEETS-sneu 1 [um kwam@ f w S. FERGUSON.`

ROCK DRILL. APPLICATION FILED JUNE 3o. |911. RENEWED DEC. 26, 1916.

391,65` 4 Patented Feb. 6,1917.

4. SHEETS-SHEET 2.

FERGUSON.

{Rocx nmLL. y APPLCATIOPS FILED JUNE 30|' 191 REHEWED DEC. 2 6. 1916.

@muted Feb. 6,1917.

xsnEETs-SHEET 3 www@ ' w/m/Essfs S. FERGUSON. 'ROCK DRILL.

APPLICATION FILED )UNE 30. '911- RENEWED DEC. 26. 1916A pis Leleoee.

Pee/euse@ @y Application filed im@ so, ieu, semi so. @sees-e. Renewal member isis. serial sie. mesi?.

To all @fiom 'it may concor-9c:

Be it known use l, Ssyiuomi FERGUSON? a. citizen of ehe 'l'niteii States of America, iesifliog as the ciy of Scotlan, in the State of @axes-e? lifiexico, have inveiiefl certain new sind useful lmproveiheii's iii Rocio 'Diills7 which the following is :1. description.

My mveniozi relates to rock drills and consists briefly oigan improved body Ioeclmmism cnpeole of receiving interchangeable iiachments foi. sdepmg it so different pui- .p-osesg thus it issy fono s peit of :L oliill of with which the paris may oe disassembled' for repsifs,',encl for their further object the elimination of uiinecesseiry wea? vibration, friction, recoil suol siij leakage.

lluyoi'flei' 'that she iiiveuiion may he more fully understood., reference is lieehy meile 'io the accompanying eli-swings, wherein- Figure l is s side View eolien ou the line i*lf, Fig. lli and showing invention embodied iii e "fliill of the hummer type; Fig'. lll is e ceolinl, Weilieal.I longitudinal seciioii of the seine; Hl is e ceriial, veiw'iczsi7 longitudinal section of an inten changeable utiachmenc eflepftefl to he npplieil o the body poi'iou oi' Athe drill of Figs. i und H; lV is a, perspective of the hammer heeel; llig. V is a perspective o'fthe iolgstahle cylinder containing the hammer head; Fig. Vl is en enlarged seotioii ou line V'lfVl', Fig. il, with parts cui; away; Fig. Vl'l.' is su eif iged seceioii on line VlVL Fig., IU; Fig: Vll is an enlarged section ou line Will-VH1., Fig. lll; Fig. IX is en enlarged. section on line lli-lli, Fig. ll, showing the operating; mechanism; :mel Fig. X is :in 'solei-ged sec tion ou. line oi lfig. l.

Similar reference numei'e's i'e'liei "so similar paris iliioe hout che dfswmgs;

'i easing' die hotly mechanism, liefe- 1 eo the mais casing prei- 'i ci n, iulzegml @cylineiu.' enel oi whichris htteai Wih oswhle heeel Leeiel exfceiiloes sie i-or... imeggi'ei, Wish she' eyiiiin vtensions. Journal boxes'oi bushings 8 are mounted in sections and s, crank shaft 5 is goumeled 'iieireui The hack heed; 2 is secured in position 'any desired simmer v.

by cap scieifls 94.pessiiig therethrough one threaded m he sections 69 and 69 'ifesoectively. The lsieiel exensious o open. i'eeiweifdly :is shown and permi the resrly removal from the cylinder l in, s diiwion' which is resiwzud end peiallel to iis suis,

of the sections 69 and 69", together with the journals cariied thereby, the crankshaft 5 und ull. peres couuecieai to and operated thereby. These puits may he iemovecl from the cylinder by meieiy iemoyiug theholts By this construction, lepaiis and i'enewals of worn parte ere ecilia-ezi, and since a one-piece oi' seamless cylinder is used. Lmnecessaiyv leakage el? sii" from he interior isevoided. The cylinder l, sections (3Q and 69', and heck heacl 3 closely fitted together, es shown, so form a, dust proof casino. l

Upon the center oi tiizrow` of the ci'aiik shef 5 is mounted e sliding journal box Y, which slides up and clown'in e cioss head il This crosshend is adapted to iecipi'oeste iougiizuciinelly in easing i, being guided lsherein hy longitudinal grooves 36 provide foi' 'that purpose, which, inthe embodimentshown, :we at she top and bosom o the casing. The operation of e, device of this kind causes an excessive amount of weer beef tween the jouiual hoX .7 "and its bearing surface in the cross head 4 which it has not seeixied possible'to obviate heretofore in s satisfactory manner. have devised a simple utdclinien; which (loes not interfere with the operation of any pesi', of the mech-- anism, consisting oi a rect-angulo? plate 3, errungen-i in the cross heeel. in Contact with journal box l", und Whiclican he adjusted to take up weuih by means oif liners emi s.

,boliA Alli.'

Wish sii-cular recess eoiisiuing e cup- Shspeol member 9, Wl Acli is sclepecl fio b over portion 12 for e, purpose to he hereiueifcei' described. Atfshe center of said circular i'eeess in the cross heed 4, e.L )sistem ioigl l0. is secured in any suiieole manne?. hy e seiew ihremi connection, seid piston soci by its ceime'ciou else seri/ing oseeu'i'e ue front of he cross helio i is piovdeil.,

Yiis

and

lo the interior of the hollow piston and adapted to engage in the teeth of the ratchet wheel 17 are pawls 21.

Piston' 15.,.is mounted within and fitted to forni a pneumatic cushion connection with is a driver or tool actuating cylinder or plunger 12-11, a portion of' which hasa sliding and rotatable within the interior of the casing 1. The rear portion 12 of said driver cylinder is of the same diameter as 2o the interior of the cup-shaped member t), so that an air cushion is formed between the two, as will be described later. The piston rod 1G extends through an opening provided therefor in the rear end of said portion 12,

the passage being made air-tight by a suitable stufling box 13. The front portion 1i of said driver cylinder is formed with an extension 11i reducedin size and bored from the rear to receive a tube/ 22, securedtherein Se in-any suitable ma'nner as by screw thread connection. Said'tube 22 is provided with interior spiral ribs 24- adapted to engage the spiral grooves 23 of the front portion of the shaft 17.

The operating mechanism for crank shaft 5 is illustrated. by Fig. 1X of the drawings, wherein removable section 69 is shown with an out-turnod annular flange. Over said section irA tted a horizontally flanged ring e0 70, provided on the outer surface of said horizon` al flange with. screw threads. A circular gea-r housing 72 is attached to said ring 70 by means of an internally threaded, circulan'hor'izontal extension on said housing, adapted to screw on the threaded horizontalwlange of said ring. Openings in said gear housing have screwed therein cups 7 3, between which and the cone bearing 74T secured to a shaft 76, re rollers 7 5. The a@ recesses in the cups 73 nd bearing 74 are located at such an angle Ywith respect to the side of the housing 72 and to the shaft 76, that by screwing said cups 73 slightly inward, the recesses are made sm'aller in diameter, thereby taking up any wear which may occur. This adjustment is convenient, siniple, and does not interferein any way with the operation of a mechanism of this character. The ends of shaft 7 6 are provided with 00 screw threads, on one of which is screwed a retaining cap 7 8, and on the other of which is screwed a. retirining cap 77, the latter having a longitudinal, ircular extension provided with external screw threads so that .(555 the driving mechanism may be attached readily to any suitable source of power. This simple means olf connection is a distinct advantage in a machine of this kind, which necessarily often is movedfrom place to place. On said shaft 76 is secured also'a 70 bevel gear 7 9, adapted to mesh with a bevel gear 71 secured in any suitable manner, as by screw threads, to an end of the crank shaft 5.

The operation of the meohanismthus far described is as follows z-l/Vhen power is applied'to the cap 77, shaft 76 is revolved, which revolution is imparted to the crank shaft 5 through gears 7 9 and 71. The rotation of said crank shaft causes the cross head 3u 4 and the attached piston rod 10 and piston 15 to reciprocate. The forward movement of said piston 15 compresses the air between its ring 20 and the front wall 87 of the portion 14 until the compression is suiiicient` 85 to cause the driver cylinder 12-14 to `move 'forward with the continuedy forward move nient of the piston l5. During this forward lnoveincnt of the piston 15, the spil'ally grooved forward extension of the shaft 17 V9() enters the tube. 22, and since said grooves are engaged by the ribs 2li on said tube, the shaft 17 rotates in the direction of the arrow shown in Fig. VI f the drawings, since the teeth of the ratchet 17 on said shaft and 95 the pawls 21 on the interior of the piston 15, are so arranged that they are inoperative during this forward movement, and their friction is less than that of the parts of the mechanism connected to the driver cylinder 12-14. On the rear movement of Ithe. piston 15, however, the pawls 2'1 opera- `tivel As efore described, said pawls 21 are engage the teeth of the ratchet 17.

mounted on the interior of the piston 15, and as said piston cannot turn, owing-to its connection by the piston rod 10 with the nonl rotatable cross head 4, the ratchet 17 is held firmly from rotation. The withdrawal then, of the now non-rotatable spiral grooved extension ofthe shaft 17 from the spirally ribbed interior of the tube 22, causes the entire driver cylinder 12-14 to rotate, together with the parts attached thereto as will be hereinafter described.

To improve the general operation and to increase the efhciency of`a drive of this type, a system of air regulation has been provided, comprising in-take port-s 18 in the driver cylinder 12-14; 'and an air .passage 11 through the piston rod 10, ratchet 17and shaft 17 Asaid air passage being provided'in the piston' and ratchet 17, with aspringpressed valve 16 opening in the direction of the arrow shown in salti air passage in Fig. 1I of the drawings. The in-tako ports 1 8 are so arranged in reference to the piston 15 that the latter acts as a valve to close a port and thereby compress the air against the pistons advance, and to uncover a port behind it Leieeee ny voc-num. The opening of the e il :it the rear end of the piston so arranged that seid opening will its rear verd stroke, the poric' cnn-Shaped member 9 fitting toet en cushion is formed, preventing knockingbetween the end of por lf2 and tbe beck Well of Seid member 9. Another air cushion is formed between rear fece o the piston and the nbc. lil. Eytlis arrangement a double mening eliect is obtained and any danger tbe respcctire beads hitting together is lrely obvio-ted. 'lie air forced through an' li through the vulve 16 during tbe moin portion the rearward stroke, posses to tire :price between retreating ring 2U and tbe front Well 87 of tbe portion le,

if. so that u full supgly of oir is there present, tlcreby uesistinw tile action of the lirontport l?- to destroy any vacuum, and insuring sufi lent air to :form a.. cushion between tbe piston und member Mon tbe forvv'nrrl stroke. ln coni non witli tbc maintenance oi un nir cushion between the piston and the ends of the driver cylinder le, the manner of Securing together the two portions thereof(i 1 driver cylinder cannot be made intees tbe pieton l5 and allied parte a joint is likely ein leakage due to heating and f il expansion of tbe parts during the 3v opere-tion oli machine, l have so located tbe of the portions 12 and 14.

Y rence to the cylinder, therefore,

3 any leelregc in seid connection will not c compression et either end, tbe retliat the piston practically' has an v linder in which to el'ect its comunct-icn. .et liront of the casing i is :i water nt- 1 injector 4l which consists of an xl 'poi-tion having en inlet end 48 pred lo be connected with any source of 'fw' 'eng-ply and an oppositely placed outlet adopted to be connected to the Water incmensioncaeing 55. In the end fortiori nozzle 46 pointing toward the ou'tlf end ind connected with tbe interior o lie i by e valve l2, forced against MJ. by e, spring 44e. The forH ment of the driver cylinder 12- orces tire elf through the nozzle 4&6, by creating :i vacuum behind the same enlarged portion and drawing fore water, where it mixes wit-h tlie nir iin'oor attore of my invention is the edziptebility of' the foregoing described en importent feature of my imlentimfi.y

drill proper to be used with dill'erent types of attachments embodying diii'erent methods of operation without any change in seid drill proper. Two preferred embodiments of suc-l1 types of attachment, both of which comprises novel features, are shown in. 'the drawings, one of 'which is ettuclied to tbe drill proper aedisclosed in ll, :md the other of which is shown se'nirntcly, as disclosed in Fig. lll.

The attachment shown in ll is of the celled hammer type, the drill being pressed :x-,gainst the rock or other Substance to be operated upon and hammered by e suitable portion of the 1necl1anism,n1uel`- after the manner in which on artisan would: be :in ordinary hund drill and bunmer. The numeral 55 indicates the casing o" tbe attachment, which preferably consists of en integral cylinder or extension casing adopted to be :itteclied readily to the marin casing l of tbe body mechanism, nu by screw threads us Shown et All llotatably mounted in the interior of said casing 55 is a long cylindricel body or sleeve 29 (Fig. Y), having interior longitudinal grooves 28.; and held in position by zibuttinf' shoulders us designated et X and by n Cep 38 which screws on the outer end of the casing 55, Attached firmly to the front end or" extension le of the driver cylinder 12H14; :is by screw' thread ettachmenuis a, l'iennner heed 26, adopted to slide within the cylindrical body and hrw-- ing ribs 27 to engage the grooves 28 in said.

cylindrical body. j

A. chuck 30 is fixed within the outer end of cylindrical. body 29, r by screw threads, abutting shoulders Y fixing their relotive positions. 'lllithin the chuck 3G is slid.- nbly mounted n bufer'blocl; 349 which re ceives the impact of the hammer head 26 on its rear end, and supports tbedrill 40 in :L socket provided for that purpose in its front end. An annular shoulder is formed on chuck 30. und i; corresponding shoulder formed on the bu'er block 34 to 'inclose a. spiral spring 3.3,V which is compressed when the drill is pressed against tbe substence'to be operated upon thereby maintaining the drill i0 in close Contact with the buii'er block 34. A nose bushing 36 at the front of tbe chuck', serves to support tbe drill 40 and for that purpose in the sli-ank of tbe drill 40. Seid rectangular key maintained in operative position QFig. 'll/l1) vby vspringlll() man pressed holt 65 secured in place by screw cap 66, said. holt being adapted to enter notches tlin the side ofthe key. The lower part of said key is cut away to provide for the withdrawal ot' the tool Il() when the key is raised, as will be evident from an inspection oi said Fig. VH. It will be evident that the forward movement et the driver cylinder lik-lli will drive the hamzner head against the buffer block 34, thereby giving the drill l0 its operating impetus. Upon the rear\'ard movement of the driver cylinder 1x2-l and attached hannner head 26 with their consequent rotation as ahove described7 the cylindrical body will he rotated by the engagement of its grooves with the rihs of the hammer head 26o- The rotation oi" the said body 29 rotates the chuck 3G fixe-d thereto, which causes the rotation of the drill el) through their hey and recess connection. so hat on the next `forward impetus the cutting edges of the drill will not strike in exactly the saine place. vlt will he noted that the engagement of said licy il? with the tool 40 is such.) that while they rotate together, tho tool has longitudinal nio-veulent indcpcin'lcntly thereof divinan to the length of its sidel recess 39, so that the energy ot' the hammer blow is uninipaired. rlhe water attachment fil. is eonnected to the water inlet of the casing 55 hy a pipe lo and elbow 47, the water being 'forced troni the outlet of said water attachment through said inlet, thence through water passages 31 provided for that purpose in cylindrical hody 29. boiler block 3l, and

drill Il@ lto the front of the drill to Wash away c ips of stone and keep the parts cool. Smtahle packing 32 is provided at necessary points to prevent water leakage.

The attachment shown in Fig. Hl is of the so-callid piston type, wherehythe drill is connected directly to the driver cylinder lQ-ll and reciprocatcs therewith. The casing of this attachment is indicated by the numeral 57 within which is a piston 58, having its iront end cored out to receive a hushing G3 in which the drill fr() is inserted. A novel lookin;r device 4for the drill is shown on this 'athxcluncnt (Figs. lll and VIH) coinirising a block (301 adapted to pass through suitable recesses prorided therefor in the piston 58 and the bushing 63 into engagement with a recess in the shank of tool all). Said hlock'() is pressed outwardly hy springs GQ, and is forced and held in operative position by a locking,r device 55), comprising; a prismoidal clamp Ahavingits base rounding' and o center, and. adapted to lit in a semi-circular recess providedlthere'for in the bottom of the chuck 58. The eccentric shape' of said base is so designed that when the top of the prismoidal cla p 59 is forced to tho'let't, (Fig. Ill) a Ca action is secured which forces block B0 more and igaieaeee more tightly against the drill. 40. lt will he evident that the impact of the drill] ed against this clamp' will cause the lockingde- '.i'ice to tighten, thereby preventing acci dental displacement oit' said drill. A slight tap is sufficient to loosen theclamp when it is desired to remove the drill 40. The block 60 then is pressed down until theftop ol. the clamp 59 will paw over shoulder 6l on said hlock GO, whereby the entire loclfrng dev'ce may be removed from the cylinder.

The external. surface of the rear of the casing 57 is provided with screw threads, the same in all respects as those on the casinar ofthe heini. .otype shown in Fig. ll. The rear end of the cylinder 58 .likewise is prolil' vided with screw threads the same in all respeels as those on the hammer head 26 of the hannner type shown in Fig. ll. lt is only necessary7 therefore,r to nnscrew the casing and hannner head of the hammer type attachmentand snhstitu e therefor the casing' and piston of the piston type attachment to ntilizo"1;he mechanism of the drill proper."y

'for the piston type of drill. Said piston type lili'cwise is provided withineans adapte ed to utilize the water attachment el, consisting of an elbow 4:7 to be connected to said attachment el, (which necessarily has the pipe Ll5 removedtherefrom when thehanny mer type of attachment is removed), and

nally adjusted to advance the tool to and from operative position. Said support is mounted on a, hase 8l, adapted to he mount ed pivotally upon` a suitable pedestal or tripod not shown. The supportlSO is provided upon its upper face with guides 88 designed to receive complementary inclined guides SQ'torxned on the lower portion of the casing'. Said support 8() also is pro- Aridcd with an offset 90 adapted` to he engaged by guiding liloclrs 82, bolted or other- .wise secured to the casing, thereby prevent` ing any upward movement of the drill relatire to its support. Formed integrally with said casing is an extension 50' having a longitudinally disposed bore 9Min which is mounted bushings :3l-52,'having outwardly turned flanges at the ends thereof.' The flange of bushing 52 is formed with a fiat upper face adapted to rest against a shuilarly formed flat face on the u'nder part of drill casinglr 1, thereby holding said bushing4 from rotation. The flange of bushing; 51 is provided with a. plurality of peripherally arranged notches a adapted to register with lone of a plurality of corresponding isegezeee '0f supper?, 8G, and is ieee? end. efe-img @wg Vied wih eningrei coli-er 93 which ms easing l 'ii-ml 'with iimide 83- e0 epeiete sei screw. By earning zhe handle' 83, the drill. es a whole can ne advanced 01' reti'ecter ef seid feed'. sei'ew mee-hw mism. y y Men-y miieioiis Wii be eppeent' to these ske in iie mrt, my nvembien .not beiiig imied the paifieuierembeiment deseibed, bue consisting broadiy efe mechn aiism edaplied te efiperzie with attach ments. ef various types, together Wii.- im.- p'evemens iiihe entire combinatie@ :md in the sevea. cenetiuent puits thei'ee,

Having thus discesed one embediiiieni: of my invention, what i' Gleim emi deeie im pmec by LelSt-ere )Patent is:

l. The Ceiiibinaien with e casing, Cif e Cipl'oeatng crees heed.i a cil'ive Cyiiiner Closed :L both endg, sind e, pismi hin.

cyinder and to Seid iieed seid, Cross iiez'i; being' with @up aepted to ckiseijv receive, e', peiiien ei seid driveiL ey'mdei therein mi 'mrm e euelieii of compressed beiweenehe we? geheien tliaiiy es sei. etii, y

2. The coizihination Wii ceeiiig ie 'e-siiepe meinem* here of, e cyizeeif' eiesed et keen eiids emi bev-- ing e, portion eieeeij Jfeeeive'ie im@ seid eupehziped i'neziibez; e piseii :miti eyiidei, azi e pisfm mei efuineceihereto emi in. seid arose "heed ie eeeiiie the eupshape' in piece, subsxbeiii-eiy es SeiJ fottii. Y- u 3. The cembmetien wim easing., Uf

ineens liei'ein comprising cjiine simeri et bi ends and; having' intake perf.; e pison in seid eyiindei, e piston rod having en aii' passage eomectingthe space in advance ef the piston Wish the space in die ireei ei? the cylinder, e, Vave coiiteiiiiig sei pee Sage, and. means for ieeeiviiig the rem' end of the eyiiier during :Bhe i'ecipmeetiqneif `ie pisen ge foim en if emilion and. te dis- 4:. The eembinatieii with :i easing, 5f e i'ecipieeeing @fees heeel, e. (iriver eyiiiidei" dem@ e@ bei/'i1 enfile, emi a piston 'Wihm seid eyidei attache/ te seid ei'osis iieef leise/on mii d emes head be giieifie wiih e iep'nec to closely' 1 iv maier emi eentifei ireeeive e, por'ion ei seid. drivel' eyimiei' therein. to form en eushie between feite ivm, .end said :Vision zuid iis msi eeiig pm vdef wi'h mi ei? e naive hei'eiii, through which eil ioreef 'i'om seid eiieiieuiiw'@up inte he ehemibe n iii-eilt of .Said pieten5 subehei'ieiiy ee eet mmh,

' The emribnetie ",vih easing', eze, recipieeeting '3i-Ose heed? e diiwerey'iinder eiesed, et bo''i ende, and :i pistoia wihiii seii eyiirider sind ei'aehed to mss heed by pieten, wd, saisi head, iieixig/ pre- 'vided-Wih e @up adapted 'se eieeei'y receive a, portion of seii ciive eyiidei' therein to feim en eig eushien beh-.veen the inve, :mii pis-ten and iis rod being pfevidef with im aix? gmssege bei' e @mi mid the miei? ei seid mi' pees? sii ne bien ef which 'wiz both ende tu iiwvefeie 1 veel 'ieetef with be Cms igig eiigitiif-inei passe mi@ "551e cup @he mi if e eiemiiei in i'eiii.; @if 'alie fmijy es fo'vbim 1 The eembiizvbeii ei a casing en ee'bu ating membey they-ein, eyiiniei' feeeed'e 300th ends emi e gfisen iie-:eii1, ene of sefif M5515 named iiiembei'e qbeing connected to Seid fieuating member and friving the eier by siii* compression, seid cylinder being eem-A 'pose of two Cupshaped 'portions Seeui'e together, the linien being edjeeeii; ehe center of' the' ejflincier whereby leakage 0f ai? et said union` is avoided,' subsmiistiaiy as Set forth.

9. The efr-mbi.

.im 'with e easing, of e cylinder therein constructed of two cupshaped portions secured together end to end, and a piston operating within said cylinder to drive said cylinder by air compression, whereby any leakage of air in the joint of said portions will iet affect the air compression formed i said cup shaped portions,

' substantially as set forth.

11. The combination with a main casing having a forward open end, of driving means therein comprising a reciprocating memL` a', a plunger having a cushion connection therewith, and an extension casing removably secured to said forward endof said main Casing, the forward end of said plunger being situated within the body formed by the main. and extension casings and provided with means for removably securing thereto interchangeable attachments, substantially as set forth.

v 12. The combination with a main casing having a forward open end provided with meansfor removable attachment of an extension casing, of driving means therein comprising a reciprocating member and a plungerhaving a cushion connection therewith, the forward end of said plunger being provided with means for -removably seV curing thereto interchangeable attachments, an extension easing and drill holding means in said extension casing in alinement with said plunger, substantially as set forth.

,13. The combination with a main casing,

of a plunger therein, means for actuating said plunger, an extension casing on the main casing, said extension casing being removable,- drill holding means carried by said extension casing, and means permitting interchangeable Iconnection of attachments of different types to said plunger, substantially as set forth. n

14. The combination with a main casing, of means therein comprising a cylinder, a piston within the cylinder, an extension casing, means therein for carrying a drill,

said eitension casing being removably eon nected with said main casing, and the forward end of said cylinder having means for removably securing interchangeable attachments, substantially as set forth.

`15. A main casing, an extension casing having a-rear open end and means for removably uniting the same to'the main casing, a cylinder having closed ends, a portion of said cylinder being movable within the main casing and a portion including the forward end thereof being movable within the extension casing and having means for removably securing interchangeable .attachments, a piston having a cushion "connection with said cylinder, and means for actuating said piston, substantially as set forth.

16. rlfhe combination of a seamless cylinder, a piston mounted therein, means comprising a transverse drive shaft for operating said piston, a removable back head closing the rear end of said cylinder and bearin-gs carried by said back head, said drive shaft being mounted in said bea-rings, sub' stantially as set forth.

17. In a drill, the combination of a cylindrical casing, a cylinder fitted to the bore thereof and having ends, a piston fitted to the bore of said cylinder, means for operating one of said last named members, an in jector, an outlet from said casing so aranged that said cylinder causes the dis charge of air from the interior of the casing into said injector, tool holding means, and a conduit for conducting fluid discharged from the injector into the tool holding means, substantially as set forth.

18. In a drill, a cylindrical casing, a cylinder fitted within the bore thereof and free to reciprocate therein, an injector communieating with the bore of said casing., said cylinder having ends and acting as a plan ger to pump air or other/fluid from the bore of sard'casing into said injector, a piston within said cylinder, means for operating said piston, toolholding means, and a conduit for condcting {luid} discharged from the., injector [into the tool holding means,

"substantially as set forth.

19. In a drill, a cylindrical casing. a cyiin der fitted within the bore theredf'find freel -to reciprocate therein, an injector eermnum nicating with .thefore of said casing, said cylinder having ends and acting as a plunger to pump air or otlarfluid from the bore of saidfcasing into saidnnjector, a piston withinilsaid cylinder, means for operatx'ig said piston, and drill holding means carried by said casing, and having a water passage :fes

therethrough, said passage communicating with the bore of said casing through said injector, substantially as set forth. i

20. In a drill, a'cylindric'al casing ,having an air outlet, an injector having a Water inlet `and an air nozzle fed from said air ontlet, a tool actuating plunger in said Casin, reciprocating means for: actuating said plunger, means for driving'said 'actua-ting means,

the movement of said plunger causing air to be forced through said outlet, tool holding i means, and a conduit fory conducting vduid discharged from the injector intothe tool holding means, substantially as set forth.

21. ln adrill, a casing, drill holding means havinga water passage therethrough, ai injectorconne'cted with said passage and hr "ing a water inlet and an air nozzle, said means having awater passage therethrough aninjector connected with said passage and having a water inlet and an air nozzle, said nozzle being fed from the interior of said casing, and unitary means for simultaneously forcing'air through said nozzle and delivering a blow upon said drill holding means, substantially as set forth.

In a drill, the combination of a. main g casing, a tool actuating.` plunger therein, a' .removable extension casmg secured to said main casing and containing drill holding means having a water passage therethrough,

and a water attachment on 4said main casing operated by air forced therethrough by the action of said plunger to force Water linto the passage in said drill holding means, substantially as set forth.

24. ln a drill, the combination with a casing, of a tool actuating plunger therein, drill holdin means having a Water passage therethrougi, and a water injector operated by air forced therethrough by the action of said plunger to force water through the passage in said drill holding means, substantially as Set forth.

In a drill, the combinationv with av main casing, of a tool actuating plunger therein, means for actuating the same, a removable extension casing on the main casing, an injector for connection with a water supply, `and a connection from the interior of the main casing to the extension casing through said injector, the movement ofsaid plunger causing water to be injected into said extension casing by air from the main casing, substantially as set forth.

26.111 a drill, the `combination with amain casing having a forwardr open end provided with means forremovabl'e attachment of an extension casing, of driving means therein jcomprising a reciprocating member and a plunger havingta cushion connection therewith, the forward end of said plunger being pro-vided with vmeans for removably securing thereto interchangeable attachmcnts, and an injector having a, nozzle communicating ,with the interior of said main casing and' supplied with air therefrom by the action of said plunger, and a forward open end provided with means for remov ably securin thereto interchangeable attachments, su istantially as set-forth.

27. In a drill, the combination with a main-casing having a forward open end provided with means for 'removable attachment of an extension casing, of tool actuating means therein comprising a reciprocating plunger, an extension casing attached to said main casing, drill 'holding means in said extension casing adapted to be operated by said plunger and having a ywater passage therein, and 'a water attachment on said main casing connected to said Water passage and actuated by air forced out of said main casing by said plunger, forth.

This specification signed. and witnessed this 10th day of J une 1911.

, SEYMOUR FERGUSQN.

Witnesses: .7

H. B. HALL, JUAN M. EA'roN.

substantially as set All 

